Expansible sleeve anchoring device



Oct. 2, 1951 J. P. PALMER INVENTOR JOHN R PALMER I 6 ATTORNEY Filed April 6, 1950 EXPANSIBLE SLEEVE ANCHORING DEVICE u nnr .0

Patented Oct. 2, 1951 EXPANSIBLE SLEEVE ANCHORIN G DEVICE John P. Palmer, Meadville, Pa., assignor to The Palmer Welloct Tool Corporation, Meadville, Pa., a corporation of Fennsylvania Application April 6, 1950, Serial No. 154,297

3 Claims.

This invention relates to expansible. sleeve anchoring devices and, more particularly, to improvements for holding together the parts of an expanding sleeve and for temporarily holding an expanding sleeve anchor in a bore hole.

The object of this invention is to provide an expanding sleeve anchor of the type wherein a hole is drilled into the formation in which anchorage is desired, and the anchor is loosely inserted in the bore hole and subsequently expanded into tight fitting engagement. Conventionally these anchors include two or more cooperating separabletparts which, together, constitute a sleeve. An anchor bolt having an enlarged or tapered portion is engaged within the parts of the sleeve but with the enlargement lying outside the sleeve. This assembly is inserted in the bore hole and then the anchor is moved so as to force the enlargement between the sleeve parts, thereby expanding them between the material around the sides of the bore hole. Usually one of the sleeve parts is provided with tabs or extensions which embrace the other part for holding the sleeve assembly together prior to expansion. The object now is to provide, on the one hand, a device applicable to the sleeve parts for holding them temporarily together so that the sleeve parts can be identically formed, and so that the sleeve parts will expand uniformly.

Another object of the invention is to provide a clip for encircling the separable parts of an expanding sleeve and having projecting prongs or tabs for catching against the wall of a bore hole so that the assembly will not fall or otherwise come out of the bore hole prior to the expanding of the sleeve. Thus the invention is intended particularly for holding expanding sleeves temporarily together, and preliminarily in bore holes, as in a mine ceiling although it is obvious that this device will have utility in holding expanding sleeves in any position wherein accidental separation and dislodgement prior to anchoring is a problem.

These and other objects will be apparent from the following specification and drawings, in which:

Fig. l is a vertical elevation of the device, broken away in parts, and showing it in place in a vertical bore hole in a mine ceiling;

Fig. 2 is a plan View of the retainer ring; and

Fig. 3 is a side elevation of the retainer ring.

Referring now to the drawing in which like reference numerals denote similar elements, the invention is intended for use with a typical anchor assembly including an expanding sleeve indicated generally at 2 which initially fits loosely over the straight shank of an anchor bolt 4 and is inserted with the bolt in a bore hole 6. In this example it will be assumed that bore hole 6 extends vertically upward in the rock ceiling of a mine. Usually on the upper end of anchor bolt 4 there is an enlarged tapered head 8 which, initially lies outside sleeve 2 but, when drawn within the sleeve, expands the two identical sleeve halves l0, l0 away from one. another to force the roughened portions l2 against the sides of the bore hole, thereby preventing withdrawal of the assembly. I

The invention is concerned particularly with the lower body portions of sleeve halves l0, 10, it being apparent from the drawing that lower body portions, aswell as the remainder of the sleeve halves, are formed identical with one another and with circumferential grooves I8 near the lower end. Grooves [8 match with one another so as to form an annular recess for receiving and elastic rubber ring 20. By the provisions of recess N3, the location of ring 20 is pre-determined and, in addition the ring is seated somewhat inwardly from the position it would occupy if engaged around the exterior of lower body portions 15 so as to avoid dislodgement of the ring during the insertion of the sleeve into the bore hole 6. When head 8 is drawn into the sleeve, rubber ring 2!! permits uniform separation of the sleeve halves l0, l0.

Ordinarily, in the proximity of grooves I8, one of the sleeve halves is provided with projecting prongs bent around to embrace the other sleeve half. The other sleeve half is either recessed to recline the prongs, in which case the recessed half bends more easily than the prong-carrying half, or the prongs lie exteriorly of the side wall of the embraced sleeve half. In this latter case the halves tend to slide with respect to one another and the prongs prevent pivot-like obstructions about which at least one of the halves tends to bend. Identical sleeve halves ID, ID, however, react symmetrically to all expanding forces and, at least initially tend to pivot apart about an axis at their bottoms as a result of the constraint of ring 24 described below.

Attention is directed now particularly to Fig. 1, wherein it is apparent that the lower ends of sleeve halves ll], H) are reduced to form an annular ledge 22 around which is fitted an annular ring 24, preferably formed of spring metal and having a plurality of tabs 26 projecting from the outer periphery. The inner periphery of ring 24 is slotted, at intervals indicated at 25, and bent downwardly to form spring lugs 21 which tightly grip ledge 22 and hold the ring in place. Tabs 26 are bent down and ring 24 is fitted around ledge 22 so that the tabs 26 trail rearwardly when the assembly is inserted in bore hole 6. An enlargement'28 should be welded or staked on the side of anchor bolt l, to keep sleeve 2 from sliding back when the assembly is extended upwardly. When completely extended, tabs 26 project outwardly from the outermost margins of sleeve 2 so that, with the first tendency towards retrograde movement of the assembly from the borehole 6, tabs 26 catch against and dig into the material around the side of the bore hole, thereby holding the assembly in place until anchor bolt 4 can be pulled to expand the sleeve 2 permanently in position, whereupon sleeve halves IE3, l0 spread uniformly outwardly to engage their roughened exteriors I2 into the sides of bore hole 6.

Isis-apparent that. the various modifications and substitutions of materials may be made for theelementsdetailed above, and that the invention is limitedonlybythe following claims.

'rna m:

l. Ifian-expaiisible-sleeveanchondevice adapted to be inserted into. 'a-b'or e hole, a plurality of substantially identical sleeve parts arcuate in cross-section-aiidadapted to form a longitudinal- 1y separable sleeve forjuxt'a'position around an expanding member, each of said sleeve parts having a roughened exteiior portion extending longitudinally along a part of its length adjacent one end thereof, whereby to'eiig age one end of said sleeve partswith the side walls of a bore hole when 'said-sl'eve i's "xpar ided therein, said sleeve partsbeing reduced in diameterat the other end thereof anda jng secured on the reduced portions ve part said rin being formed or n tal and-having outer peripheral projecyiriig extriorly of said'sleeve whenthe lat- [not expanded, whereby upon insertion of l e in ajborehol, to engage the side walls ole and hold said sleeve temporarily ace i ftil the latter expanded, said ring a, ntly engaging and--constricting the sleeve parts whereby resiliently to hold the latter-to e r a aid othe 1 7 ienna tions 1 2. The combination claimed in claim 1, said ring having a substantially annular body formed of spring metal, said outer peripheral projections comprising prongs integral with said body and bent from the radial plane thereof in a direction generally opposite to the direction of insertion of said sleeve in said bore hole.

3; An expansible sleeve anchor device comprising a plurality of sleeve partsarcuate in cross-section and adapted to cooperate with one another to form a longitudinally separable sleeve for juxtaposition around an anchor bolt or the like expanding member having an enlargement thereon at one end whereby, upon axial movement of the enlargement with respect to the sleeve, to separate the sleeve parts at one end of said device and thereby expand the sleeve into a bore hole, each of said sleeve parts having a ledge thereon adjacent the other ends thereof and lying interiorly of the outer. periphery thereof whereby, whenvsaid parts. arejuxtaposed, to form an-annular seat atv said other end of said device, a ring fitting around. saidrseat, prongsonsaid ring extending outwardly fromthe adjacent peripheral limits of said sleevewhereby upon insertion. of said device in aborehole, to engage the side walls of s'aid bore holeand hold said device temporarily in place, and spring lugs, onsaid ring extending inwardly against thetperiphery of, said annular seat whereby yieldingly to hold: the sleeve parts together at said other end of said device.

JOHN P. PALMER.

anrnnnNoEs crrnp v The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 750,536 Haggerty Jan-."26, 1904 895,756 r Eleister Aug; 25, 1908 1,349,213? Royer Aug. 10, 1920 1,361,335; Devlin Dec. 14:, 1920 1,976,193, Steenrod Oct, 9, 1934 2,399,069- Y Skinner Apr; 23, 1946- 

